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Title: Direct writing of plane-by-plane tilted fiber Bragg gratings using a femtosecond laser
Authors: Ioannou, Andreas 
Theodosiou, Antreas 
Caucheteur, Christophe 
Kalli, Kyriacos 
Keywords: Bragg gratings;Fiber Bragg gratings;Refractive index;Femtosecond laser inscriptions;Higher order gratings;Tilted fiber Bragg grating
Category: Materials Engineering
Field: Engineering and Technology
Issue Date: 15-Dec-2017
Publisher: OSA - The Optical Society
Source: Optics Letters, 2017, vol. 42, no. 24, pp. 5198-5201
Journal: Optics letters 
Abstract: In this Letter, we report a flexible, plane-by-plane direct write inscription method for the development of tailored, tilted fiber Bragg gratings using a femtosecond laser. Compared to ultraviolet or femtosecond laser inscription based on the phase mask, interferometric, or point-by-point methods, the presented approach is far more flexible and offers several advantages. Laser inscription is made through the fiber coating, while the grating planes are controlled to minimize birefringence, with precise control over the wavelength location and strength of cladding modes. Tenth-order gratings were produced in the C L bands so that higher-order gratings could be studied at shorter wavelengths. In particular, we show that the refractometric sensitivity depends on the grating order, ranging from ~28 nm∕refractive index unit (RIU) at ~1510 nm to ~13 nm∕RIU at ~1260 nm.
URI: 1539-4794 (online)
ISSN: 0146-9592 (print)
DOI: 10.1364/OL.42.005198
Rights: © 2017 Optical Society of America.
Type: Article
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